Last updated 2026-07-10
TL;DR
By 12 months, most kids have at least one real word and can follow a simple instruction. By 18 months, the American Speech-Language-Hearing Association expects somewhere between 10 and 25 words, along with the ability to understand one-step commands. If your child isn't hitting these marks consistently, that's worth acting on: request a free evaluation rather than waiting to see what happens.
What speech milestones should a 12-month-old hit?
By 12 months, most kids have said one real word: not a babble sound that the family has decided counts, but something the child uses on purpose and repeats to mean the same thing each time, like "ma" for mom or "ba" for bottle. That single, consistent word is what people mean when they talk about this milestone [1].
There's a lot happening around that one word, though, and most of it doesn't sound like speech at all. A 12-month-old points at what they want, waves bye-bye, holds a toy out to show you. Those gestures matter more than they seem to, because they show the child already gets that communication runs both ways, even before the words are there to prove it [2].
Understanding almost always outpaces talking at this stage. Your child should know their own name, respond to "no," and come when you say "come here." Watch for them turning toward familiar people when you name them, or pausing and glancing up when they catch a familiar word buried in a longer sentence [1].
Babbling should sound fairly developed by now too, with strings like "dada," "mama," "baba" rising and falling the way real sentences do. If babbling has stayed flat and monotone, or if it was there at 8 or 9 months and then tapered off, that's worth writing down and bringing up with someone.
What are the 18 month speech and language milestones?
By 18 months, the American Speech-Language-Hearing Association puts the expected vocabulary range at 10 to 25 words [1]. The AAP and CDC land on similar figures, treating 18 months as the point where a child should say at least 10 words [3]. That 10-word floor is the number pediatricians actually watch, and a child who hasn't reached it at this age meets the common definition of a late talker, which puts them in a category where monitoring or evaluation makes sense.
The words don't need to be pronounced perfectly to count. "Wawa" for water is fine. "Buh" for bus is fine too, as long as the child says it the same way each time and means it on purpose. What doesn't count: sounds only a parent can decode, one-off vocalizations, or a word said once and never heard again.
Understanding should also have taken a real leap forward by this age. A child should be able to follow a one-step direction with no gesture attached, something like "bring me your shoes" while you keep your hands still and your eyes off the shoes [1]. They should point to several body parts when you name them, recognize 50 or more words they still can't say themselves, and follow familiar routines just from hearing them described [3].
Gestures keep building on top of this. Pointing to request something, reaching a finger toward a cup because they want it, is expected by 12 months. By 18 months a child should also point just to share attention, jabbing a finger at a dog so you'll look at it too, not because they want you to hand it over. That sharing gesture is called protodeclarative pointing, and its absence after 14 to 15 months is a recognized early sign of autism [2].
What's the normal word count progression from 12 to 18 months?
Growth between 12 and 18 months happens in fits and starts, not a straight climb. Many children sit at just 1 to 4 words for most of this stretch, then hit a burst around 16 to 18 months where new words show up almost daily. That burst is real, and it's well documented in language acquisition research [4].
| Age | Expected vocabulary (expressive words) | Receptive vocabulary |
|---|---|---|
| 12 months | 1-3 words | ~50 words understood |
| 14 months | 3-6 words | ~100 words understood |
| 16 months | 7-15 words | ~150 words understood |
| 18 months | 10-25 words | 200+ words understood |
These numbers come from ASHA milestone data and match up with the MacArthur-Bates Communicative Development Inventories (CDI), a widely used research tool for early language [4][1]. The CDI data show a huge range between children: some reach 50 words by 16 months, while others hit exactly 10 at 18 months and go on to have completely typical language. That width is the whole point. Normal covers a lot of ground here, but there's still a floor below it.
It's worth mentioning the 50-word mark too, even though most children don't reach it until closer to 24 months. CDI norming studies found that most kids get there somewhere between 18 and 24 months, and reaching that vocabulary size tends to line up with the start of two-word combinations [4]. So what a child is doing at 18 months gives a decent preview of where they'll land a few months down the road.
Speech red flags to watch for at 12 to 18 months
Pediatric speech-language pathologists work from a short list of observable behaviors that flag a child for closer attention. None of them is a diagnosis on its own. They're just signals worth paying attention to.
At 12 months, the clearest ones are: no babbling with consonants, no gestures like waving or pointing, no response to their own name when someone calls it calmly from across the room, and no single words [2][3]. If any of these are missing at 12 months, bring it up with your pediatrician right away rather than waiting to see if things change by 15 or 18 months.
By 15 months, a child with no words at all, or one who had words and then lost them, needs to be referred for an evaluation. Losing words or gestures at any age is an automatic red flag and one of the core early indicators in AAP autism screening guidance [3].
At 18 months, pay attention to whether a child has fewer than 10 words, only points to request things rather than to share interest, struggles to follow simple directions without a gesture or visual cue to help, gets frustrated often when trying to communicate, or uses very little variety in sounds.
What catches parents off guard is that a child who seems to understand everything but says almost nothing is still worth having evaluated. It's normal for understanding to run ahead of talking. A huge gap between the two is not. A child who clearly understands 200 words but says only 3 by 18 months has an expressive language delay, even with comprehension fully intact [1].
What's the difference between a late talker and a language disorder?
The distinction matters a lot, because the path forward and the likely outcome aren't the same for both.
A late talker is a child under 30 months who has a smaller vocabulary than you'd expect but understands language normally, plays and engages socially the way other kids do, and hears fine [5]. Somewhere between 50 and 70 percent of late talkers catch up on their own without any formal therapy. Researchers actually call these kids "late bloomers" [5]. That label sounds comforting until you realize the catch: there's no reliable way to know ahead of time which child will catch up and which one won't.
A language disorder is something else entirely. It goes beyond a low word count. The child might struggle to understand language, use words in unusual ways, have trouble processing what's said to them, or have an underlying condition, such as autism, childhood apraxia of speech, or hearing loss, driving the delay [6]. For these kids, waiting it out actually costs something. Starting intervention before age 3 leads to meaningfully better outcomes than starting the same intervention at 4 or 5 [12].
If you've read about childhood apraxia of speech, you already know it's a motor planning issue rather than a comprehension one. A child with apraxia may understand every word said to them and want badly to talk, but their brain can't reliably sequence the sounds needed to get words out. That's a fundamentally different problem than simply not having built up a big enough vocabulary yet.
Speech-language pathologists don't sort children into these categories based on how worried a parent sounds on the phone. They use standardized assessments to tell the two apart. That's really the whole point of getting an evaluation: it replaces guesswork with actual data.
How does hearing affect speech at this age?
Hearing loss is the first thing a speech-language pathologist will want to rule out when a child misses milestones, and it should be the first thing on your mind too. Roughly 1 to 3 in every 1,000 US children are born with some degree of hearing loss, and not every case gets caught at the birth screening [8].
Even mild or fluctuating hearing loss from repeated ear infections can shift early language. A child stuck in a cycle of fluid-in-the-ear across several months between 12 and 18 months may miss a lot of speech input right when it matters most. That's different from permanent sensorineural hearing loss, but in the short run it can look a lot like it, producing similar delays.
ASHA recommends an audiological evaluation as part of the initial workup when a child isn't meeting speech milestones, done before or alongside the speech-language evaluation [1]. Pediatric audiologists know how to test hearing in kids far too young to raise a hand at a beep, and these exams are separate from whatever screening happened at birth.
So here's the practical version: if your 15-month-old doesn't reliably startle at loud sounds, doesn't turn toward your voice, or seems to hear fine in a quiet room but tunes out the moment there's background noise, say something. Don't chalk it up to them just ignoring you.
When should you request a speech evaluation?
Earlier than most parents think, and earlier than many pediatricians suggest.
Current AAP guidance recommends developmental surveillance at every well-child visit plus standardized developmental screening at 9, 18, and 30 months [3]. Surveillance isn't the same thing as an evaluation, and if something worries you at 14 months, there's no rule saying you have to sit on it until the 18-month checkup.
ASHA's position is that any child not meeting age-level communication milestones should be referred for a full speech-language evaluation [1], and sooner is always better than later. The Part C program under the Individuals with Disabilities Education Act (IDEA) guarantees free evaluation and services for children under 3 with developmental delays, including speech and language delays [7]. You don't need a diagnosis to ask for one, and in most states you don't even need a pediatrician's referral: you can call your state's early intervention program yourself [7].
Say your child is 18 months old and has fewer than 10 words. That's reason enough to request an evaluation now rather than waiting for the next scheduled checkup. It costs nothing through early intervention, and it replaces guessing with an actual answer. If your child turns out to be fine, you'll know that. If there's a real delay, you'll have caught it while services still have the best chance of working.
For a closer look at how that call actually goes and what happens once you make it, see the early intervention guide on this site.
What can parents do at home to support speech development?
There's real research behind this, and the strategies that keep turning up in studies of parent-implemented language intervention are specific enough to actually put into practice.
Talk during routines more than during playtime. Bath time, diaper changes, car rides: these are high-repetition moments where the same language shows up in the same context day after day, and that repetition builds comprehension faster than any toy [9].
Try "parallel talk," where you narrate what your child is doing rather than what you're doing. "You're pushing the ball. The ball is rolling. It went far." This hands your child words for their own experience without asking them to perform on cue.
Cut screens for children under 18 to 24 months, with video calls to real people as the one exception [10]. The AAP is blunt about this: background TV lowers both the quality and the quantity of parent speech directed at the child, which lowers language input. Educational baby videos don't reliably add vocabulary either.
Follow your child's lead. If they grab a spoon and bang it, the spoon is the topic now, so talk about the spoon rather than steering them toward the toy you'd rather they play with.
Cut questions and add comments instead. Parents of late talkers often quiz without meaning to: "What's that? What color? What do you want?" Comments like "that's a big truck" carry less pressure and pull more spontaneous language out of a child than questions do [9].
Parents who want more structured daily support can look at apps like Little Words, which pairs modeling activities with progress tracking so you're doing more than improvising day to day.
None of this replaces an evaluation or therapy if your child actually has a delay. But every strategy here works for any child in this age range, delayed or not.
Does bilingual or multilingual exposure delay speech?
No, it doesn't. Kids growing up with two or more languages hit the same overall language milestones as kids who only hear one, the words just get split between languages [11]. So a child who says 5 words in English and 6 in Spanish actually has 11 words total, not 5, not 6.
ASHA puts it plainly: "a communication difference is not a communication disorder" [11]. That means an SLP evaluating a bilingual child needs to account for both languages. Test only in English, and you'll systematically undercount the vocabulary of a child who also speaks Spanish or Mandarin or whatever else is spoken at home.
None of this means bilingualism protects against real delays. A child from a bilingual household who isn't meeting milestones in either language, counting every word across every language they hear, still needs an evaluation. The reasons would be the same ones you'd check for in a monolingual child: hearing, motor issues, neurological factors, or something in the environment.
If you're worried and your child is hearing more than one language, say so plainly to your pediatrician and to whoever ends up evaluating them. Ask directly how they plan to count vocabulary across languages. If they can't give you a clear answer, it's worth finding someone who can.
Could a speech delay at 18 months indicate autism?
It's possible, and it deserves a clear look rather than either panic or denial.
Speech and language differences are among the most common early signs of autism. The AAP recommends screening all children for autism at 18 and 24 months with a validated tool like the M-CHAT-R/F [3]. If your 18-month visit didn't include that screening, ask for it.
What tends to separate an autism-linked language delay from a plain late-talker profile is the social piece: less eye contact, little pointing, not showing you things, not turning when their name is called, not imitating what others do [2][3]. A child can be a late talker with none of that going on. A child who has several of these signs along with the language delay has a profile worth a full developmental evaluation.
Watch for echolalia too: a child repeating phrases from TV shows, books, or overheard conversations instead of putting together their own words. This happens in typical development sometimes, but it tends to run longer and more noticeably in some autistic children [6]. If most of your child's "words" turn out to be borrowed scripts, bring that up with whoever evaluates them. The echolalia and echolalia meaning articles cover this in more detail.
When a child does receive an autism diagnosis, the therapy that follows looks somewhat different from treatment for other causes of delay. You can read more about autism spectrum speech therapy and what the evidence says about starting it early.
One last note: an evaluation at 18 months won't hand you a diagnosis in a single visit. It's the start of a process, not the end of one. Starting early beats waiting, every time.
What happens during a speech-language evaluation for a toddler?
Most parents don't know what to expect from a speech evaluation, and that uncertainty is exactly what makes them wait too long to book one.
An SLP evaluating a child in this age range does a few things [6]. First, they take a detailed case history from you: pregnancy and birth, feeding history, hearing, any family history of speech or language delays, and your child's current communication. It helps to come with specifics rather than impressions: how many words your child uses, what those words are, and whether they use them consistently.
Then the SLP watches the child directly, usually during play. They're paying attention to eye contact, pointing, imitation, attention, how the child asks for something they want, and what happens when a message doesn't land.
They may also run a standardized assessment. For toddlers, common options include the Bayley Scales of Infant and Toddler Development, the Preschool Language Scales (PLS-5), and the Rossetti Infant-Toddler Language Scale, all of which compare your child against normed data from same-age peers [6].
At the end, the SLP will tell you whether your child's skills fall within typical limits. If they don't, the SLP explains how big the gap is and what comes next: monitoring, parent coaching, or direct therapy.
Early intervention, for children under 3, happens in the "natural environment", often right in your home, and is free or very low cost regardless of insurance [7]. If you're wondering what ongoing sessions with an SLP actually involve once therapy starts, the speech therapy speech therapist article walks through it.
None of this is something to dread. It's just information, and it's worth going to get it.
Frequently asked questions
How many words should a 12-month-old say?
At 12 months, the benchmark is at least one real word used consistently and on purpose, though some children have 2 to 4 words by then. The word doesn't need clean pronunciation: "ba" for ball counts if the child uses it reliably for that object. Babbling, pointing, and responding to their name matter just as much as the word count itself.
Is it normal for a 15-month-old to not be talking?
It depends on what "not talking" actually means. A 15-month-old with no words at all sits below the expected range, and that's worth raising at the next pediatric visit rather than waiting until 18 months. A child with 2 to 4 words plus good comprehension and pointing is on the low end of normal and worth watching closely. Any child who had words and then lost them needs evaluation promptly.
What counts as a word for a 16-month-old?
A word counts when the child uses a consistent sound to mean a specific thing, every time. "Da" for dog, said whenever the dog appears, counts. "Wawa" for water counts too. A word said once and never repeated doesn't count toward vocabulary, but family-specific invented words do. What matters is consistency and intention, not how accurate the pronunciation is.
My 18-month-old understands everything but doesn't talk. Should I worry?
Strong comprehension is a good sign, but it doesn't cancel out an expressive delay. A child who understands 200-plus words but says fewer than 10 by 18 months has an expressive language delay, even with intact receptive language. This sometimes resolves on its own, but some children in this group go on to need therapy, so an evaluation gives you real information instead of guesses.
What is the difference between a speech delay and a language delay?
Speech delay means trouble with the sounds and articulation of words: pronunciation, clarity, the motor coordination for talking. Language delay means trouble with the communication system itself, things like vocabulary size, understanding sentences, and combining words. Many young children have both. A speech-language pathologist evaluates both areas and can tell you which one, or both, is affecting a given child.
Can watching TV cause a speech delay at this age?
There's no clean evidence that screen time causes delays in otherwise typical children, but the AAP recommends avoiding solo screen use under 18 to 24 months for a practical reason: time in front of a screen is time not talking with a real person, and conversational interaction drives early language. Background TV has also been shown to lower both the quantity and quality of parent speech to the child.
How do I get a free speech evaluation for my toddler?
In the US, the Individuals with Disabilities Education Act (IDEA) Part C requires every state to provide free evaluations and services for children under 3 with developmental delays, including speech and language delays. You can self-refer by calling your state's early intervention program directly, and you don't need a diagnosis or a pediatrician's referral first. Services, if recommended, are free or minimal cost based on family income.
Do bilingual children hit speech milestones later?
No. Bilingual children meet the same overall milestones, but their words may split across two languages. A child with 8 words in English and 7 in Spanish has 15 words total, which clears the 18-month benchmark. Any speech-language pathologist assessing a bilingual child should count vocabulary across all languages combined; bilingualism itself does not cause speech delay.
What are the earliest signs of autism related to speech?
The AAP recommends autism screening at 18 and 24 months. Early language-related signs include not responding to their name consistently, limited pointing to share interest, reduced imitation, and loss of words or gestures already acquired. Combined with reduced eye contact or social engagement, these form a profile worth evaluating. A speech delay alone can't diagnose autism, but the overlap is common enough that both should be assessed together.
My child says a lot of sounds but no clear words at 18 months. Is that a problem?
Yes, this is worth an evaluation. Rich babbling and vocal play are positive signs, but by 18 months a child should have at least 10 words used intentionally and consistently. Lots of vocalizing with no clear words sometimes means the child has good oral motor skills but hasn't yet mapped sounds to meaning, or there's an expressive language difficulty underneath it. An SLP can tell these possibilities apart.
How does early intervention help with speech delays?
Early intervention services for children under 3 usually involve a speech-language pathologist working with the child at home or in another natural setting, often alongside parent coaching. Research consistently finds intervention before age 3 produces better outcomes than the same intervention started later, because the brain is in a phase of fast language network development. Services are free or low cost through IDEA Part C.
What's the vocabulary explosion and when does it happen?
The vocabulary explosion, sometimes called the naming explosion, is a stretch when a child goes from adding words slowly to learning several new ones per week. In most children it lands between 16 and 24 months, often after they reach around 50 words. MacArthur-Bates CDI norming studies show it's linked to the arrival of two-word combinations, though not every child has a dramatic burst: some just add words steadily across this period.
Should I use baby sign language if my child isn't talking?
Using a small set of functional signs alongside speech is generally supported by speech-language pathologists for children delayed in expressive language. The evidence doesn't show signing delays speech; some research even suggests it lowers frustration and may support language learning. The key is to always pair signs with the spoken word rather than replacing it. This is different from AAC devices, which are used for children with more significant communication needs.
Here's the rewritten source list. Since this is purely a citation list with no prose to rework, I've kept it as the sources section it is:Sources
- American Speech-Language-Hearing Association (ASHA), speech and language milestones: ASHA's expected ranges for vocabulary (10-25 words by 18 months), understanding of language, and gestures between 12 and 18 months
- CDC, Learn the Signs Act Early: developmental milestones: CDC checklists for 12 and 18 months covering pointing, response to name, and gestures, plus protodeclarative pointing as a red flag for autism
- American Academy of Pediatrics (AAP), developmental surveillance and screening policy: AAP guidance to screen development at 9, 18, and 30 months, screen for autism at 18 and 24 months with the M-CHAT-R/F, and expect at least 10 words by 18 months
- MacArthur-Bates Communicative Development Inventories (CDI), norming data: norming studies tracking vocabulary growth from 12 to 18 months, the vocabulary burst, and how a 50-word vocabulary tends to precede two-word combinations
- Rescorla, L. (2011). Late talkers: Do good predictors of outcome exist? Developmental Disabilities Research Reviews, 17(2), 141-150.: an estimate that 50 to 70% of late talkers catch up on their own, and a note on how hard it is to predict which children will without an evaluation
- ASHA, speech-language pathology scope of practice: a rundown of assessment tools for toddlers such as the PLS-5, Bayley Scales, and Rossetti, and the SLP's role in telling a late talker apart from a language disorder
- US Department of Education, IDEA Part C early intervention program: IDEA Part C guarantees a free evaluation and services for children under 3 with developmental delays, including speech-language delays, and parents can refer their own child
- CDC, Hearing Loss in Children data and statistics: roughly 1 to 3 per 1,000 children born in the US have detectable hearing loss, and fluctuating hearing loss from ear infections can affect early language
- Girolametto, L., & Weitzman, E. (2002). Responsiveness of child care providers in interactions with toddlers. American Journal of Speech-Language Pathology, 11(3), 268-280.: comparing parent comments (parallel talk) against questions, comments produce more spontaneous language from the child, and following the child's lead is a supported coaching technique
- American Academy of Pediatrics, media and young minds policy statement (Pediatrics, 2016): AAP advises against solo screen use before 18-24 months, since background TV cuts down on both the quality and amount of parent speech directed at the child
- ASHA, bilingual and multilingual communication development: ASHA's position that bilingualism is a communication difference, not a disorder, and that vocabulary should be counted across all of a child's languages during assessment
- Warren, S. F., & Brady, N. C. (2007). The role of maternal responsivity in the development of children with intellectual disabilities. Mental Retardation and Developmental Disabilities Research Reviews, 13(4), 330-338.: evidence that starting intervention before age 3 leads to notably better language outcomes than starting later
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